Dry pipe for steam boilers



De.9,.1930. H. MARTIN 1,784,638

DRY PIPE FOR STEAM BOILERS Filed April 22, 1929 x INVENTDR fi'an/IJ. Mar-fin HTTURNEY Patented Dec. 9, 1930 UNITED STATES FRANK J. MARTIN, F WEIRLTON, WEST VIRGINIA DRY PIPE FOR STEAM BOILERS Application filed April 22,

This invention relates broadly to steam boilers, and more particularly to dry pipes for such boilers.

The primary object of the invention is to.

provide means for filtering of the water of condensation from steam generated in a boiler thereby to dry and purify such steam prior to its entering the main steam line leading to engines, turbines, or the like, so as to prevent the many various objections resultant from steam otherwise treated, among which may be mentioned eroded turbine blades, sticking of traps and meters, inoperative safety de-' vices, and frequent piston ring displacement.

A further object of the invention is to provide a device of the character mentioned for maintainin a constant flow of steam from the boiler, thereby obviating the pulsating of the water level in the boiler such as exists under present or ordinary conditions.

A still further object of the invention is to provide for removal of foreign matter suspended in the water of the boiler, and more particularly to incorporate same in the means for draining the water of condensation from the boiler.

In describing the invention in detail, referv ence is herein had to the accompanying drawings, in which- Figure 1 is a side elevation of the invention, parts being broken away and in section to illustrate the present invention;

Figure 2 is a topplan view of the tank, partly broken away and in section; and--- Figure 3 is an enlarged section on line 33, Fig. 1.

The present invention is shown in connection with a boiler 1 of the usual stationary type having a safety valve 1. Straps 2 are connected to the top of the boiler and support a tank 3 interiorly of said boiler. Steam inlet nipples or pipes 4 are secured to the opposite ends of the tank 3 and face upwardly, as shown in Fig. 1. A perforated baffle plate 5 is horizontally mounted within the tank and is disposed above the lower ends of the pipes 4, while transverse bafiles 10 may be lo cated between the underside of the baffle plate 5 and at opposite sides of the steam outlet from said tank. A series of outlet cou- 1929;' Serial No. 357,004.

plings Gdepend from the bottom of the tank and are connected to a common drain pipe 9, thelatter preferably inclined toward the rear end of the boiler so as to facilitate drainingof the water from the-tank 3.

The top of the tank isprovided with a steam outlet pipe 7 which latter is snugly fitted within the-outlet pipe 8 of the boiler. As shown in Fig. 1 of the drawings, the outer end of the drain pipe 9 extends downwardly and has an inclined part 12 provided with a valve 11, said valve being. controlled by a hand wheel 13. The valve 11 extends below the water'level and is used for the purpose of drawing off sediment and foreign matter suspended in the water of the boiler. The size ofthe opening of the valvemaybe manually controlled to increase or decrease the size of said opening according to the amount of concentration of sodium salts and organic matter held in suspension in the boiler. Obviously, said valve 11, termed in the art a blow down, prevents high concentration of solids in the boilerthat is to say, said valve functions to reduce the concentration of solventswithin the boiler and thus to prevent foaming and priming.

In operation, steam generated within the boiler rises and enters the inlets 4, which latter constitute the only'outlet for the steam. The steam in rising within the tank 3 necessarily passes through the minute perforations 5 of the baffle 5, so that the water is filtered and falls by gravity to the bottom of the tank, whence it gravitates through the outlet connections 6 into the pipe 9, and from the latter is led to a sewer, automatic discharge, or the like. The dry steam which passes upward through the baffle plate 5 is conducted through the. outlet 7 of the tank 9 into the boiler outlet 8 and thence goes to the main steam line.

The baflie plates 10 in the tank 3 tend to equalize the pressure of the steam entering the tank and to retard the passage of the steam and to deflect the latter upward through the perforations of the baffle 5, with the end in view more effectively to extract the moisture carried by the steam. I

From the foregoing, itwill be seen that the outlet of the pipe 9 functions in a dual extending outward from the boiler, and a conmanner, first, for draining the water of continuously operative blow-down associated densation from the tank and, second, for with said draining means. 7

draining the sediment, foreign matter, and In testimony whereof, I aflix my signature.

the like from the boiler, and thus to provide FRANK J. MARTIN. 70

a simple, economical and compact structure for performing both of these functions.

What is claimed is 1. In combination with a steam boiler having an outlet, a tank within the boiler having a central outlet connected to the boiler outlet and having steam inlets at its ends, a horizontal perforated baflie plate in the tank located above the inlets, transverse bafile'plates in the tank between the bottom thereof and the horizontal baflle, a serieso-f outlets for the water of condensation leading downwardly from the bottom of the tank, a horizontal drain pipe connected to each of said series of outlets and extending through the boiler, and a valve controlledbranch leading from said drain pipe into the boiler below the water levelin the latter for draining ofi' sediment and the like,

2. In combination with a steam boiler having, an outlet, a tank Within the boiler having a central outlet connected to the boiler outvtank within the boiler having a steam inlet and having an outlet extending through the boiler, filtering means for the steam in the tank, means to drain the water of condensation collecting in the tank therefrom and to conduct same without the boiler, and a valve controlled sediment outlet in said draining means extending into the boiler below the water level in the latter for drawing off sediment and the like which collects in the boiler.

4. In combination with a steam boiler having an outlet, a tankwithin the boiler having an! outlet connected to the boiler outlet and ,having steam inlets at its ends, a horizontal perforated bafile plate in the tank, aseries of outlets for the water ofjcondensation lead-' ing from the bottom of the tank, and draining means connected to each of said outlets :havingsteam inlets at its ends, ahorizontal -.-perforated baffle plateinthe tank, a series of outlets for-the water of condensation lead- 111g from the bottom of 1 thetank, draining means connected to=each of said outlets and 

